Characterization of a fish symbiont of Photobacterium phosphoreum with altered spectral properties (abstract of paper presented at 14th International Symposium on Bioluminescence and Chemiluminescence)

Whitakei, S., Herring, P.J., Campbell, A.K., Hill, P.J. and Rees, C.E.D. (2006) Characterization of a fish symbiont of Photobacterium phosphoreum with altered spectral properties (abstract of paper presented at 14th International Symposium on Bioluminescence and Chemiluminescence). Luminescence, 21 (5), 296-297. (doi:10.1002/bio.941).

Abstract

Bacteria cultured from the photophore of a Physiculus spp. fish recovered from the Arabian Sea produced a distinctive blue luminescence that was brighter than other isolates on laboratory culture. Morphological characterization and biochemical profiling suggested that this bacterium belonged to the species Photobacterium phosphoreum, and 16S sequence analysis confirmed that this isolate was closely related to this species. Analysis of luxA identified only small differences in the gene sequence, but the two organisms had different autoinducer profiles. Spectral analysis confirmed that the luminescence had a different λ_max value to that of P. phosphoreum and a novellum P (lumazine) gene was identified. This would account for the different spectral properties and suggests that this bacterium represents a new subspecies of P. phosphoreum.

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